The problem does not provide as much information as the questions of problem need.

If the triangles the problem refers to are the triangles formed by diagonals of 4 sided polygons then you need to specify it, because there is an infinite number of possibilities of drawing triangles in the given 4 sided polygons.

Considering these triangles as those formed by diagonals, then they are congruent if only 4 sided polygons are congruent.

If all the lengths of each of 4 sided polygons are equal, then they are squares or rhombus.

You may find the lengths of each 4 sided polygons considering the congruence condition CD=HJ.

Substituting the equation 2x + 3 for CD and 3x + 2 for HJ yields:

2x + 3 = 3x + 2 => 2x - 3x = 2 - 3 => -x = -1 => x = 1

You need to substitute 1 for x in 2x + 3 and 3x + 2 such that:

CD = 2 + 3 = 5 units => by congruence yields that HJ = 5 units.

Hence, evaluating the lengths of CD and HJ yields that they measure 5 units each.